In many cases it is not possible to approximate the electronic wave function by a single configuration because some configurations are (almost) degenerate and need to be included in the wave function from the beginning. In the Multiconfigurational SCF (MCSCF) method the N-electron wave function is approximated by a linear combination of CSFs.

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Within the MCSCF formalism different kinds of wave functions can be constructed. The most common one is based on the Complete Active Space SCF(CASSCF) method

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